<template>
    <div class="xtx-carousel" @mouseenter="stop()" @mouseleave="start()">
      <ul class="carousel-body">
        <li class="carousel-item " v-for="(item, index) in sliders" :key="index" :class="{fade:activeIndex === index}">
          <RouterLink :to="item.hrefUrl" v-if="item.imgUrl">
            <img
              :src="item.imgUrl"
              alt=""
            />
          </RouterLink>
          <div v-else class="slider">
          <RouterLink v-for="goods in item" :key="goods.id" :to="`/product/${goods.id}`">
            <img :src="goods.picture" alt="">
            <p class="name ellipsis">{{goods.name}}</p>
            <p class="price">&yen;{{goods.price}}</p>
          </RouterLink>
        </div>
        </li>
      </ul>
      <a @click="toggle(-1)" href="javascript:;" class="carousel-btn prev">
        <i class="iconfont icon-angle-left"></i>
      </a>
      <a @click="toggle(1)" href="javascript:;" class="carousel-btn next">
        <i class="iconfont icon-angle-right"></i>
      </a>
      <div class="carousel-indicator">
        <span @click="activeIndex = index" v-for="(item, index) in sliders" :key="index" :class="{active: activeIndex === index}"></span>
      </div>
    </div>
</template>

<script>
import { onUnmounted, ref, watch } from 'vue'
export default {
  name: 'XtxCarousel',
  props: {
    sliders: {
      type: Array,
      default: () => []
    },
    autoPlay: {
      type: Boolean,
      default: false
    },
    duration: {
      type: Number,
      default: 2000
    }
  },
  setup (props) {
    const activeIndex = ref(0)
    let timer = null
    // 自动轮播
    const auouPalyFn = () => {
      clearInterval(timer)
      timer = setInterval(() => {
        activeIndex.value++
        if (activeIndex.value >= props.sliders.length) {
          activeIndex.value = 0
        }
      }, props.duration)
    }
    watch(() => props.sliders, (newValue) => {
      if (newValue.length > 1 && props.autoPlay) {
        auouPalyFn()
      }
    }, { immediate: true })
    // 鼠标进入自动暂停 离开播放
    const stop = () => {
      if (timer) return clearInterval(timer)
    }
    const start = () => {
      if (props.sliders.length && props.autoPlay) {
        auouPalyFn()
      }
    }
    // 切换上下张
    const toggle = (step) => {
      const newIndex = activeIndex.value + step
      if (newIndex > props.sliders.length - 1) {
        activeIndex.value = 0
        return
      }
      if (newIndex < 0) {
        activeIndex.value = props.sliders.length - 1
      }
      activeIndex.value = newIndex
    }
    // 离开销毁
    onUnmounted(() => {
      clearInterval(timer)
    })
    return { activeIndex, stop, start, toggle }
  }
}
</script>

<style scoped lang="less">
  .xtx-carousel {
    width: 100%;
    height: 100%;
    min-width: 300px;
    min-height: 150px;
    position: relative;
    .carousel {
      &-body {
        width: 100%;
        height: 100%;
      }
      &-item {
        width: 100%;
        height: 100%;
        position: absolute;
        left: 0;
        top: 0;
        opacity: 0;
        transition: opacity 0.5s linear;
        &.fade {
          opacity: 1;
          z-index: 1;
        }
        img {
          width: 100%;
          height: 100%;
        }
      }
      &-indicator {
        position: absolute;
        left: 0;
        bottom: 20px;
        z-index: 2;
        width: 100%;
        text-align: center;
        span {
          display: inline-block;
          width: 12px;
          height: 12px;
          background: rgba(0, 0, 0, 0.2);
          border-radius: 50%;
          cursor: pointer;
          ~ span {
            margin-left: 12px;
          }
          &.active {
            background: #fff;
          }
        }
      }
      &-btn {
        width: 44px;
        height: 44px;
        background: rgba(0, 0, 0, 0.2);
        color: #fff;
        border-radius: 50%;
        position: absolute;
        top: 228px;
        z-index: 2;
        text-align: center;
        line-height: 44px;
        opacity: 0;
        transition: all 0.5s;
        &.prev {
          left: 20px;
        }
        &.next {
          right: 20px;
        }
      }
    }
    &:hover {
      .carousel-btn {
        opacity: 1;
      }
    }
  }
  // 轮播商品
.slider {
  display: flex;
  justify-content: space-around;
  padding: 0 40px;
  > a {
    width: 240px;
    text-align: center;
    img {
      padding: 20px;
      width: 230px!important;
      height: 230px!important;
    }
    .name {
      font-size: 16px;
      color: #666;
      padding: 0 40px;
    }
    .price {
      font-size: 16px;
      color: @priceColor;
      margin-top: 15px;
    }
  }
}
</style>
